The Collaborative International Dictionary of English v.0.48:

After-glow \Aft"er-glow\, n.
   A glow of refulgence in the western sky after sunset.
   [1913 Webster]

WordNet (r) 3.0 (2006):

afterglow
    n 1: a glow sometimes seen in the sky after sunset
    2: the pleasure of remembering some pleasant event; "he basked
       in the afterglow of his victory"

Moby Thesaurus II by Grady Ward, 1.0:

76 Moby Thesaurus words for "afterglow":
   afterbirth, afterclap, aftercrop, aftereffect, aftergrowth,
   afterimage, aftermath, afterpain, aftertaste, air glow, balance,
   butt, butt end, by-product, candescence, candle ends, chaff,
   debris, detritus, end, fag end, filings, flush, fossil, gleam,
   glint, gloss, glow, holdover, husks, incandescence, leavings,
   leftovers, luster, odds and ends, offscourings, orts, parings,
   placenta, rags, refuse, relics, remainder, remains, remnant,
   residue, residuum, rest, roach, rubbish, ruins, rump, sawdust,
   scourings, scraps, secundines, shadow, shavings, sheen, shine,
   shininess, shining light, side effect, skylight, straw, stubble,
   stump, sunset glow, survival, sweepings, trace, track, trail,
   vestige, wake, waste